But theres more:
12 Man Standard Unique Keeper
Keepers can be held for no more than 3 seasons and they are then back in the draft. Draft in the 4th give up a 3rd and so on.

I am 7-1 right now but have lost Dalvin Cook and likely Zeke. Do I give up Doug Martin and Mike Williams who can both be kept for a 6th next season for Freeman who is ineligible to be kept? Or do I stick it out and hope for the best?